Clamping device.



UNITED sTATEs PATENT oEEioE.

AXEL LEVEDAHL, OF AURORA, ILLINOIS, ASSIGNOR T0 AURORA AUTOMATICMACHINERY COMPANY', OF AURORA,. ILLINOIS, A. CORPORATION OF DELA- WARE.

T 0 all whom it may concern.'

Be it known that I, AXEL LEVEDAHL, a citizen of the United States, and aresident of Aurora, in the county of Kane and State of Illinois, haveinvented certain new and useful Improvements in Clamping Devices; and Ido hereby declare that the following is a full, clear, and exactdescription thereof, reference being had to the accompanying drawings,and to the letters of reference marked thereon, which form a part ofthis specification. q This invention relates to a clamping device ofthat type comprisingy a rotatable member, a non-rotatable member havingscrew-threaded connection therewith, and a yielding or compressiblewasher interposed between said members and acting to prevent turning orloosening of said members relatively-to each other when the same aresubjected to jars or vibrations.

The clamping device, forming the subject-matter of the presentinvention, is particularly designed for clamping together the ends xof asplit-bearing of a connecting rod or the like.

The invention includes means, in connection with such yielding washerand the parts associated therewith, adapted to increase the resistanceto the turning of the rotatable member or the like.

The invention also includes a compressible washer so constructed thatthe friction between the contacting surfaces of the rotatable member andthe washer lwill not be lessened or decreased by the presence orentrance of lubricant between such parts, to-

gether with means for preventing rotation of the washer during thecompression of the same between the rotatable and non-rotable members.

The invention also includes means for ters hereinafter described andmore particularly pointed out in the appended claims.

In the accompanving draw1ngs-F1gure 1 is a side view in side elevationof a connect- Specication of Letters Patent.

Patented uly 4,1916.

Application led May 11, 1914. Serial No. 837,656.

ingrod having applied thereto a clamping device constructed inaccordance with my invention; Fig. 2 is a front fragmentary other.

In the accompanying drawings is illustrated a connecting rod 10, of thattype having at one end thereof a split-bearing, consisting Aof twooppositely facing, semi-circular bearing members 11, 12, hinged togetherat their outer ends by the pivot pin 13, and adapted to encircle and tobe clamped about a crank-shaft, pin or the like (not shown), with'whichthe connecting rod is to be engaged. As shown, the member 11 is integralwith the rod and constitutes the fixed bearing member thereof. Themember 12 forms the swinging bearing member of the rod, and its free endportion 14 is adapted to contact with and to be clamped to the endportion of the rod, with which the fixed bearing member 11 is madeintegral.

Mv clamping device, a preferred form of which is illustrated in thedrawings, is shown as applied for the purpose of clamping the bearingmember 12 to the rod 10. The said member 12 is provided with a bolt hole15, and the rod 10 with a registering bolt hole 16, the latter beingprovided with internal screw threads. A screw bolt 17 is insertedthrough the hole 15, and is provided at one end with screw threadsadapted to engage the screw-threaded hole 16. Said bolt 17 is providedwith a head 18 adapted to bear against the member 12, and saidbolt-head, as shown in the drawings, has the form of an annular flangemade integral with and of a greater diameter than the shank of the bolt.d

For the purpose of increasing theresistance to the turning of the bolthead 18, relatively to the member 12, in the clamping of said member androd together by said bolt, a washer 19 of yieldable and compressiblematerial is inserted between the said first mentioned parts. The shankof said bolt is inserted thi'oi'ighsaid'washer 'and them latteris'"adaptedv tow bel-"compressed between. 1.

the bolt-head 18 andthe member 12, when-innernends into the bolt hole15.

uiiange23 ofsaidirin 21 Cprovidedzivith a the boltL-isjftightenedtoeffect.thefclaniping i y togetherfof the parts 1 0 y and 1 2. gi;Dlllfizng the compression ofthe washer 19, the latter is held fromrotation by means to be' liereel inafter described, and the frictionbetween-` the' 'c'ontactii'igA smooth inner face ofthe ro-y tatingbolt-head 18 and the adjacent flat surface of the non-rotatable 'washer19 is increased yas thewasheris compressed.k In order toY provideVincreased yresistance to the turning of: the boltfhefad 1S relatively tothe non rotatable Washer 19, said bolt-'head is provided, initsinnensmootlisurface, with a plurality of concave ,recesses 20,20, intowhich `portions 19a of the adjacent pai-tofV the washer: are forcedduring the compres-` sion 0f thewlatter Any backward rotation of thebolt-head will be resisted by such por-y tions 19a which project'y intosaid recesses 20, 20, `and which portions 19 lmustbe depressed to permitany backward turning' or loosening of thebolt.

The washer 19 is made from a material which, in -addition to beingyieldable and compressible, will not absorb grease or oil, and as aconsequence, thesurfaces of the head 18 and the washer, which are infrictional contact with each other, will be protected from the entrancebetween them of oil, grease or other lubricant that would tend todecrease the friction between said surfaces. T he washer 19 ispreferably made of cork, as it has been found that such material willnot absorb oil or grease, and will prevent access of the sameto thebearing surface of the bolt-head.

The washer 19, normally and prior to compression, (seeiFigs. 6 and 7,)has the same diameter as the bolt-head 18, and to confine the washerwhile under compression and prevent the same from being spread radiallyor laterally beyond its normal diameter during its compression, anannular member or ring 21 is applied around the Washer, the interiorsurfaces of said ring beingcylindrical and of substantially the samediameter as the bolt head. The washer 19, before being subjected topressure, is

`preferably longer than the height of the ring 21, as shown in saidFigs. 6 and 7, and said washer 19 fits closely within said ring. Thebase of said ring 21 is adapted to seatagainst an annular bearingsurface or seat 22 formed on the outer face of the end portion lit ofthe bearing member 12. Said seat 22 surrounds the bolt hole 15 and isconcentric with the'same. Said ring 21 is provided at the base thereofwith an inwardly extending, annular flange 23 which fer f tiall"lockingmatches-24:, as `best shown iii-lii-g. 2

said,` 'notchesbei'ng l'shownjas' opnin gaat their The base urali ty of"inwardly" 'e'. 'di g, V,circumjo-rvlocking arms 25 adaptedto-'entersaid notches when the ring 21 is seated on the bearmgmember 12.The tongues or arms 25.

yare inclined outwardly from the base flange 23, andthe notches 24 aredeeper at their inner ends than at their outer ends to correspond withthe inclination of said arms. The side Walls of the notches 21constitute shoulders against which the tongues or arms are adapted toabut, and serve to pre'- vent rotationof said ring in the turning of lthe bolt-head. j The central opening between .theinner ends ofthetongues or arms 25 isf' large enough to permit the bolt 1T to hetinserted therethrough.y

As shown in Figs. 3 and 5, when the ring 21 is placed against thebearing surface 22, spaces or recesses are formed between the arms25,and into suchspaces or recesses portions 19b of the inner face of thewasher 19 are forcedy during compression of the same. These portions19", which projectV into said spaces, have interlocking engagementl withthe'sides of the locking arms-25, thereby preventing rotation of thewasher within the ring during compression of the same by the turning ofthe bolt. The {iange 23 and arms 25, extending inwardly from the base ofthe ring 21, give to said ring a cup-shaped form.

The clamping device, above described and shown in the drawings, is usedin the `following manner: The yieldable washer 19 is inserted in thering 21 with its inner face in contact with the base flange 23. Theclamping member or bolt 17 is then inserted through the washer and ringand into the holes 15, 16. A Wrench or like tool is applied to the endportion 26 of the bolt and the latter rotated to effect the clamping ofthe parts 10 and 12. As the bolt-head 18 is drawn toward the opposingsurface 22 of the member 12, the washer 19 and rinnr 21 are broughtagainst said bearing seat 22, and the' locking arms 25 of saliti` ring21 enter the locking notches 2l. lVhen such parts are interlocked, thering 21 is held from ro tation during the turning of the bolt-head. Asthe rotation of the bolt-head is continued, said bolt-head is drawntoward the member 12 and acts to force the yieldable washer 19 into thering 21 and compress the said washer between the bolt head and theopposing surface 22 of the member 12. The ring 21 being held againstrotation and sur-rounding thewasher, said ring prevents radial spreadingor expanding of the washer as the same is compressed, and the portlons19b of the inner surface of the washer are forced into the spacesbetween the arms or tongues 25, so as to hold the washer from rotationduring its compression. As the washer is compressed parts of the sameare forced into the recesses 20, 20 of the bolthead. When the bolt'hasbeen tightened to a desired or necessary extent,backward turning orloosening thereof will be prevented by the interlocking of the ring 21with the member 12, the interlocking of the washer with the arms on saidring, and the engage,- ment ofthe projecting parts 19a with the recesses20.0f the bolt-head. In other words, the frictional resistance to theturning of the bolt-head on the washer is greatly increased by theportions 19a of the outer surface of the washer projecting into the saidrecesses 20, inasmuch as such portionsll);l must be forcibly depressedin order to permit rotation of the bolt-head. Such depression of thesaid projecting parts'ld)l cannot be effected except by the applicationof such force Yin turning the bolt as will further compress the materialof the washer in the space in which it is closely confined. Similarly,the projecting parts 19b on the inner surface of the washer will be heldin interlocking relation to the arms 25 on the ring 21, by the pressureon the material of the Washer while confined in such space. Moreover,the ring or annular member 21 acts to hold the washer under compressionunder the pressure applied thereto. The washer 19 being made of amaterial that will not absorb greasegor oil, the contacting surfaces ofthe washer and bolt-head will not be subject to the action of lubricant,s uch as would decrease the friction between such parts. The bolt-head18, having a diameter substantiallyequal to that of the internaldiameter of the ring, acts to entirely inclose or confine the yieldingmaterial of the washer, so that the latter may besubjected tol a highdegree of pressure in the tightening of the bolt. Moreover, the washeris entirely surrounded and inclosed by the ring and other parts, so thatit is entirely protected from mechanical injury.

The recesses 20, 20 in the inner bearingY ,surface of the bolt-head 18and the spaces formed between the locking arms 25 when the ring isseated against the bearing surface of the member 12 form irregularannular bearing surfaces against which the outer and inner surfaces ofthe washer 19- are held when the washer is under compression, and theinterlocking of the outer and inner bearing surfaces of the washer withsaid irregular annular bearing surfaces acts to prevent rotation' of thewasher relatively to the member 12 in the turning of the bolthead, andfurthermore, the interlocking of `the said irregular the outer bearingsurface of the washer with bearing surface of the bolt-head acts toresist the backward turning ofthe bolt-head, as hereinbefore stated.

In the form of device shown in the drawings, the member 12 constitutesthe non-rotatable member and the bolt-head 18 the rotatable member, theyielding washer 19 being interposed between said members.

The clamping device herein described and shown may be appliedto preventthe backward turning of'a nut as Well as a bolt, and I do not wish to belimited to the specific features of construction herein described andshown in the drawings further than pointed out in the appended claims.v'

I claim as my invention:

1. The combination with a non-rotative member and a rotative memberhaving screw-threaded engagement therewith, of awasher of yieldingmaterial interposed be' tween said members, and a ring surrounding saidwasher and having interlocking connection with said non-rotative member,said ro; tative member having a part adapted to enter said ring, saidpart bearing on said washer and adapted to compress the same in saidring and against the. opposed' surface of said non-rotative member,lwhen said rotative member is turned relatively to said ring and saidnon-rotative member.

2. The combination with a non-rotative member and a rotative memberhaving screw-threaded. engagement therewith, of a. washer of yieldingmaterial interposed between said members, and a ring surrounding saidwasher and having interlocking connection with said non-rotative member,said rotative member having a part adapted toenter said ring, said partbearing on said washer and adapted to compress the same in said ring andagainst the opposed surface of said non-rotative member, when saidrotative member is turned relatively to said ring and said non-rotativemember, and the bearing surfaces of said part and said non-rotativemember in contact with said washer having recesses in which portions ofsaid washer are forced when the latter is placed under compremion.

3. The combination with a non-rotative member and a rotative member`having screw-threaded engagement therewith, of a cork washer interposedbetween said members, and a ring surrounding said washer and haringinterlocking connection with said non-rotative member, said rotativemember having a. part adapted to enter said ring, said part bearing onsaid washer and adapted to compress the same in said ring and againstthe opposed surface of said nonrota'tive member, when said rotativemember is turned relatively to said ring and said non-rotative member.

,4. The combination with a non-rotative loo I ringfrom rotation whensaid rotative meminember and a. rotative member having' ber 1s turned. Ll L Y with, ef at b nnectionatheizewifth; hf ff11H35 y iintenpoedobe iiringtbeing pro'ni'dediwith mn inwardlywprojectingi gavmsff and saidrotative' rneihber surface"againstiwhch said;:washerfiiorced;`

vided u 1nV ,t1 Lasher isff 0 notch'adapt y lia'vi'iig"a'fpin't 'b.t1-ing; gaint said"`\i(a`sher, witlr'a 'plm'al'ityf lockingnotches'fadaptedz? a'daptedfto' enterv said 'ring` 'and Iforce 5 the]rtorec'eiie saidlv.a1"mvs,f"anjdtheisurface 'ofls'aid 5 w'Sheiytheifcin'to and against saidno'n-'ro-v non-'rotativenie/mberffbetween"iv said-"2a'rms;45 tatii'cineniher,k whensaidjrotative(member is. forming spaceegvard the-'bearing' surfacesoff:yturned ielatii'e'ly'to' saidinga'nd said noney said rotative memberMinacontact-iwith said;y j

rotative member.L i 'f f5" washerbeingprovidedWith-recessesgwporf-f 5.Theycombination"with la4 non-rotative tions ofsaid'washer'being'fforcedinto: Said o rncinber-` and a rotative"member havingspaces*between'saidlockingarmsandrfintofo screw-threaded `connectiontherewith?,l of a`r the recesses! in saidrotative:memberwhen`waher'ofyiclding inaterial interposed be saidfwsheriisAplaced-undercompression-fji tween Said '1nen1bers,`and firing'ysurrounding In testimony 'thatl I claim 'ftheiforegoingx' said Washer,ring beingvproirided Witha as myfinvention affix my sigiiatureinI-the 5plilralityfof inwardly 'projecting'lccking presence of two Witnesses,ythis Qndf'day ofr55 n arms `adapted toextend'beneath said Washer, a MayAl. D. 19145.` y v f t said non-rotativemember being provided in f AXELLEVEDAHL.1- c

its surface `ingrained: whichV said Washer is Witnesses: A forced with apluralityv of locking notches Y' M. COKELY,

0 adapted to receive said arms, to hold said J."E.'BARBER. f*

